21679850 has 48 divisors (see below), whose sum is σ = 42425856. Its totient is φ = 8232000.

The previous prime is 21679843. The next prime is 21679871. The reversal of 21679850 is 5897612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109952 + ... + 110148.

It is an arithmetic number, because the mean of its divisors is an integer number (883872).

Almost surely, 2^21679850 is an apocalyptic number.

21679850 is a deficient number, since it is larger than the sum of its proper divisors (20746006).

21679850 is a wasteful number, since it uses less digits than its factorization.

21679850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 21679850 is about 4656.1625830720. The cubic root of 21679850 is about 278.8380847325.

The spelling of 21679850 in words is "twenty-one million, six hundred seventy-nine thousand, eight hundred fifty".